Before a cell divides, it must first make an exact copy of all its DNA.

Here's why:

* DNA contains the genetic instructions: DNA holds the blueprint for all the cell's functions and characteristics.

* Each new cell needs a complete set: When a cell divides, each daughter cell needs a complete set of DNA instructions to function properly.

* The process of copying DNA is called replication: This process ensures that each daughter cell receives an identical copy of the parent cell's DNA.

Let me know if you'd like to know more about DNA replication!